As-designed

As-designed refers to the way a product, part, system, or process is defined in its original design documentation. In industrial and regulated manufacturing, this typically means the configuration documented in engineering drawings, CAD models, bills of materials (BOM), specifications, and controlled design records before any manufacturing deviations, changes, or field modifications are applied.

What “as-designed” includes

In a manufacturing context, as-designed commonly covers:

• The approved design intent: dimensions, tolerances, materials, and performance requirements.
• Engineering BOMs (EBOMs) that describe which components are intended to be used and how they fit together.
• Design-level process or method assumptions, such as required operations, inspection points, or special characteristics embedded in drawings or models.
• Versioned design data under document control, including revision levels and change history.

As-designed information is usually managed in PLM, PDM, or engineering document control systems and is a key input for MES/ERP, routing creation, and quality planning.

How “as-designed” is used operationally

Operational systems often compare the as-designed state to other lifecycle states to maintain control and traceability, for example:

• As-designed vs. as-planned: translating design data into a manufacturing plan, including routings, work instructions, and MBOMs.
• As-designed vs. as-built: verifying that the product manufactured and recorded in MES/ERP matches the original engineering definition, or documenting controlled deviations.
• As-designed vs. as-maintained: in MRO or field service, comparing the original design to the current configuration in service.

In regulated environments, maintaining a clear link between as-designed data and as-built records supports traceability, change control, and evidence for audits and investigations.

What “as-designed” does not mean

• It does not describe the actual physical state of a product after manufacturing or repair (that is covered by terms like as-built or as-maintained).
• It is not limited to CAD models; it includes all controlled design documentation that defines the intended configuration.
• It does not inherently reflect unapproved shop-floor workarounds, tribal knowledge, or undocumented changes.

Common confusion

• As-designed vs. as-built: As-designed is the intended configuration from engineering. As-built is the recorded configuration of what was actually produced, including approved deviations and substitutions.
• As-designed vs. as-planned: As-designed is the product definition. As-planned is the manufacturing plan derived from that definition, including operations, resources, and sequencing.
• As-designed vs. as-maintained: As-designed is the original design baseline. As-maintained reflects the current configuration in service after repairs, upgrades, and part replacements.